clinical evaluation trial about prediction of treatment effect of chemotherapy or chemoradiotherapy for gastrointestinal cancer using oxygen saturation imaging endoscopy

Interventions: oxygen saturation imaging Primary outcome(s): correlation between oxygen saturation of tissue surface before chemotherapy or chemoradiotherapy evaluated with oxygen saturation imaging and treatment efficacy Study Design: Single arm Non-randomized干预措施：氧饱和度成像（oxygen saturation imaging） 主要结局指标：采用氧饱和度成像评估的化疗或放化疗前组织表面氧饱和度与治疗疗效之间的相关性 研究设计：单臂非随机研究